<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
	</head>
	<body>
		<div id="abc" class="box" data-age="12" data-height="212">我是box</div>

		<script>
			var boxEl = document.querySelector('.box') // as HTMLDivElement

			console.log('boxEl.dataset', boxEl.dataset)
		</script>
	</body>
</html>
